INNOVATIONS IN ROADS & PAVEMENTS. Donald Burton Highways England

Transcription

1 INNOVATIONS IN ROADS & PAVEMENTS Donald Burton Highways England

2 Roads Investment Strategy (RIS)

3 RIS 2

4 RIS 2

5 RIS 2 Clouds of Doom or New Horizons?

6 Roads Investment Strategy (RIS)

7 Background (1) Technical innovation is needed to help Highways England deliver the Road Investment Strategy (RIS) Problem: no consistent approach to assess innovation Solution: Industry (UKPLG) have helped HE develop a rational approach to assess new technology. The underlying philosophy of the assessment procedure: To determine whether the technology being proposed is cost-effective and sustainable. The assessment approach is also intended to deliver improved technology with minimal wasted time and funding on the part of the innovator. The procedure is summarised in a tabular form and is intended only for pavement materials, design and construction solutions

8 Background(2) Highways England will assess and approve each stage of the process with formal recognition of the stages Proposals need to fit HE s KPIs To illustrate the properties and potential use of the technology being proposed, where possible, existing testing/procedures together with a business case will be used. The approach is presented in tabular form with guidance notes and can be found on the HE website: d+materials.pdf A summary of the approach is given:

9 Table 1

10 Table 2 Technology Readiness Levels

11 How can lime fit into the RIS vision?

12 How can lime fit into the RIS vision? Traditional Use in Pavements is in Stabilisation of poor substrates Filler in asphalt What are the new opportunities? Industry needs to promote ideas and solutions

13 Highways England working with Industry ukplg (Pavement Liaison Group) BSI (British Standards Institute) Britpave MPA (Mineral Products Association) BLA (British Lime Association)

14 Ground Stabilisation

15 BS1924:1990 Update Stabilized materials for civil engineering purposes. Methods of test for cementstabilized and lime-stabilized materials HE sponsored update to standard Compatible with BS EN standards Public comment period from end Nov 2017 Includes LWD test method

16 BS 9227 (New Standard) This BS will cover Two construction techniques; in-situ and ex-situ; Three Hydraulically Bound Mixtures (HBM), namely Roller Compacted Concrete (RCC), Hydraulically Bound Granular Mixtures (HBGM) and Hydraulic Soil Stabilisation (HSS), for their use in pavement applications.

17 BS 9227 (New Standard) Example specifications and construction techniques will be in appendices Drafting panel set up by B510/4 and work has begun Draft due to be completed July 2018 Public comment autumn 2018

18 New Innovation Spectrographic Analysis of Roads at Traffic Speed (SARTS)

19 The Problem Modern Road Surfaces deteriorate rapidly towards the end of their serviceable life The time between noticeable visible deterioration and unserviceability can be 1 to 2 years TSCS rely on binder to maintain integrity of mat rather than binder and aggregate/fines interlock in HRA

20 The Concept Binders become harder and oxidise when exposed to air/water/sunlight Binders eventually loose adhesion to aggregate A chemical change in the binder must have occurred over time Measurement of the change in chemical properties will indicate point at which binder looses adhesion and pavement surface looses integrity

21 The Red Sky Thinking

22 The Red Sky Thinking If a rover named Curiosity travelling over the surface of Mars can determine the chemical composition of rocks by performing spectroscopic analysis then surely we can measure the chemical composition of a road pavement surface on earth.

23 The Red Sky Thinking

24 The Red Sky Thinking

25 Reflectance IR spectra from the surface of an asphalt slab aged in the UV Chamber for 4 weeks Absorbance Wavenumbers (cm 1 ) 0 weeks 1 week 2 weeks 3 weeks 4 weeks

26 SARTS 1.2 million investment Developing sensor technology Road Trials to start 2018 Due for implementation 2021

27 Innovation in HE is full steam ahead

28 Thank you for listening All photographs are Anne Burton